新世纪英语专业综合教程unit8课后答案lecturenotes.docx
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新世纪英语专业综合教程unit8课后答案lecturenotes.docx
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新世纪英语专业综合教程unit8课后答案lecturenotes
Unit8
Unit8FocusonGlobalWarming
SectionOnePre-readingActivities
Culturalinformation
1.Globalwarming
GlobalwarmingistheincreaseintheaveragetemperatureofEarth‘snear-surfaceairand
oceanssincethemid-20thcenturyanditsprojectedcontinuation.Mostoftheobserved
temperatureincreasesincethemiddleofthe20thcenturywascausedbyincreasingconcentrations
ofgreenhousegases,whichresultsfromhumanactivitysuchasfossilfuelburningand
deforestation.
Anincreaseinglobaltemperaturewillcausesealevelstoriseandwillchangetheamount
andpatternofprecipitation,probablyincludingexpansionofsubtropicaldeserts.Warmingis
expectedtobestrongestintheArcticandwouldbeassociatedwithcontinuingretreatofglaciers,
permafrostandseaice.Otherlikelyeffectsincludechangesinthefrequencyandintensityof
extremeweatherevents,speciesextinctions,andchangesinagriculturalyields.
SectionTwoGlobalReading
ITextanalysis
1.Fromwhichperspectivesdoesthetextaddresstheissueofglobalwarming?
Thetextaddressestheissuefromthreeperspectives—thegeneralpublicconcern,itscauses
andconsequences,andpracticalactionstotackletheproblem.
2.What'stheauthor'spurposeofwriting?
Toraisepeople'sconsciousnessofthepotentialdangersofglobalwarming,andtosuggest
someactionstocombatit.
IIStructuralanalysis
1.Dividethetextintopartsbycompletingthetable.
Paragraphs
Mainidea
1-2
Theauthortellsthereasonwhypeoplearenowincreasinglyconcernedaboutglobalwarming.
3-7
Theauthortracesthecausesofglobalwarminganddiscussestheconsequencesofit.
8-11
Theauthorputsforwardsomesuggestionsonwhatistobedone.
2.Figureoutthesub-ideasinthesecondpart.
1)thecausesoftherisingconcentrationofgreenhousegasesintheatmosphere(Paragraphs3and
4)
2)theeffectofsuchconcentrationonclimatechange(Paragraphs5and6)
3)thepotentialthreatofglobalwarmingtohumanhealthandsurvival(Paragraph7)
SectionThreeDetailedReading
1
Unit8
TextI
FocusonGlobalWarming
JohnWeier
Twenty-fiveyearsagoifyoumadeatriptothelocallibraryandperusedtheperiodical1
fewaupwithonlyhaveonglobalwarming,you'dprobablycomesectionforarticles
geopoliticalesotericablurbinsomeabstractsfromhardcoresciencejournalsormaybe
thesubjecthasbecomeasattestsmagazine.AsanInternetsearchonglobalwarmingnow
12ormicrowavecooking.consciousnessasMadonnarootedinourpublic
2.WiththepossibleexceptionofanotherworldPerhapsallthisattentionisdeserved
threatwar,giantasteroid,oranincurableplague,globalwarmingmaybethesinglelargest
2ofoftonsandcarshavespewedplanet.toourbillionsFordecadeshumanfactories
greenhousegasesintotheatmosphere,andtheclimatehasbeguntoshowsomesignsof
3ourwedon'tcurbseethisasaharbingerofwhatistocome.Ifwarming.Many
andbeawashinseawater,raincouldgreenhousegasemissions,thenlow-lyingnations
droughtpatternsacrosstheworldcouldchange,hurricanescouldbecomemorefrequent,
andElNinoscouldbecomemoreintense.
OurWarmingPlanet
3Whathasworriedmanypeoplenowisthatoverthepast250yearshumanshavebeen
ofgreenhousegasesintheatmosphere.Ourfactories,concentrationartificiallyraisingthe
powerplants,andcarsburncoalandgasolineandspitoutaseeminglyendlessstreamof
totrashproducemillionsofpoundsofmethanebyallowingourcarbondioxide.We
cattle.andbybreedinglargeherdsofmethane-belchingdecomposeinlandfills
unnaturalamountsNitrogen-basedfertilizers,whichweuseonnearlyallourcrops,releaseofnitrogenoxideintotheatmosphere.
4Oncethesecarbon-basedgreenhousegasesgetintotheatmosphere,theystaythere
fordecadesorlonger.AccordingtotheIntergovernmentalPanelonClimateChange(IPCC)and31percentlevelssincetheindustrialrevolution,carbondioxidehaveincreased
methanelevelshaveincreased151percent.Paleoclimatereadingstakenfromfossilrecords
greenhousegases,areattheirhighestshowthatthesegases,twoofthemostabundantlevelsinthepast420,000years.Manyscientistsfearthattheincreasedconcentrationsof
IngreenhousegaseshavepreventedadditionalthermalradiationfromleavingtheEarth.
satmosphereinmuchthesameheatintheEarthessence,thesegasesaretrappingexcess'4waythatawindshieldtrapssolarenergythatentersacar.
5Temperaturedata5backclimateMuchoftheavailabledataappeartothesefears.
surfacesourcesgatheredfrommanydifferentallacrossthetheglobeshowthat
thesurfacetheofandlowerincludesEarth,oftemperaturethewhichtheatmosphere
ocean,hasrisendramaticallyoverseveraldecades.Worldwidemeasurementsofsealevel
showariseof0.1to0.2metersoverthelastcentury.That'℃sanincreaseofroughly1s'recessionevery4,000years.Readingsgatheredfromglaciersrevealasteadyoftheworldcontinentalglaciers.Takentogether,allofthesedatasuggestthatoverthelastcenturythe
planethasexperiencedthelargestincreaseinsurfacetemperaturein1,000years.
2
Unit8
6Notsurprisingly,manyscientistsspeculatethatsuchchangesintheclimatewill
6Accordingtothecooldays.IPCC,landsurfaceprobablyresultinhotterdaysandfewer
areaswillincreaseintemperatureoverthesummermonthsmuchmorethantheocean.
Themid-latitudetohigh-latituderegionsintheNorthernHemisphere—areassuchasthe
ContinentalUnitedStates,Canada,andSiberia—willlikelywarmthemost.Theseregions
couldexceedmeanglobalwarmingbyasmuchas40percent.
7Asfarashumanhealthisconcerned,thosehithardestwillprobablyberesidentsof
7Aslightagainstchangesinclimate.poorercountriesthatdonothavethefundstofend
increaseinheatandraininequatorialregionswouldlikelysparkanincreasein
vector-bornediseasessuchasmalaria.Moreintenserainsandhurricanescouldcausemore
severefloodingandmoredeathsincoastalregionsandalongriverbeds.Evenamoderate
riseinsealevelcouldthreatenthecoastlinesoflow-lyingislandssuchastheMaldives.All
acrosstheglobe,hottersummerscouldleadtomorecasesofheatstrokeanddeaths
amongthosewhoarevulnerable,suchasolderpeoplewithheartproblems.Thewarmer
temperaturesmayalsoleadtohigherlevelsofnear-surfaceozonefromcarsandfactories,
whichwouldlikelycausemoreperilousairqualitydaysandhospitaladmissionsforthose
withrespiratoryproblems.
TakingActions
88warmingGlobalwarming.takeactionstoslowdownglobalFortunately,wecan
resultsprimarilyfromhumanactivitiesthatreleaseheat-trappinggasesandparticlesinto
theair.Themostimportantcausesincludetheburningoffossilfuelssuchascoal,gas,and
oil,anddeforestation.Toreducetheemissionofheat-trappinggaseslikecarbondioxide,
offossilfuels,usetechnologiesmethane,andnitrousoxides,wecancurbourconsumptionthetheforestsinamountofemissionswhereverpossible,andprotectthatreducethe
world.
9thosetheimpactsofglobalwarmingandWecanalsodothingstomitigateadaptto
9e.g.,throughcarefulplanningandotherstrategiesthatreduceourmostlikelytooccur,
vulnerabilitytoglobalwarming.
10willcombatglobal'tstopthere.WearealsoadvocatingpoliciesthatcanButwe
fuels,alternativethelongterm,thingslikecleancarsthatrunonwarmingover
environmentallyresponsiblerenewableenergytechnologies,andstoppingtheclear-cutting
ofvaluableforests.
11—problem.Itwilltakeeveryonegovernments,isClearly,globalwarmingahuge
difference.realtogetherworkingtomakeaindustry,communitiesandindividuals
Fortunatelyyoucanbepartofthem.
Paragraphs1-2
Questions
1.Whyhavepeopleshownincreasingconcernaboutglobalwarming?
(Paragraph2)
Theanswerliesinthesecondparagraph:
itisaharbingerofwhatistocome—thethreat
tolow-lyingnations,changeofrainanddroughtpatterns,frequenthurricanesandintenseEl
Ninos.
3
Unit8
WordsandExpressions
vt.toreadthroughsomething,especiallyinordertofindthepartyouareinterestedin1.peruse
Heopenedanewspaperandbegantoperusethepersonalads.e.g.Derivation:
perusaln.
e.g.abriefperusal
Hesentacopyofthereporttothegovernorsfortheirperusal.
2.periodicaln.apublicationthatappearsatfixedintervals,esp.oneofaseriouskind
e.g.Shehaswrittenforseverallegalperiodicals.
Derivation:
periodn.
periodica.occurringorappearingat(esp.regular)intervals定期的,周期的
periodicallyad.
3.comeupwithtothinkofanidea,plan,reply,etc.
e.g.Noonehascomeupwithaconvincingexplanationofwhydinosaursdiedout.
Thescientistsarebeatingtheirbrainstryingtocomeupwithasolutiontotheproblem.
4.attestvt./vi.todemonstrate,todeclaretobetrue
e.g.Theluxuriousfurnishingsattestedtothefamily'swealth.
Theperfectionoftheirdesignisattestedbythefactthattheyhavesurvivedforthousandsof
years.
Collocation:
attest(to)sth.
Derivation:
attestationn.
5.consciousnessn.
1)theconditionofbeingawakeandunderstandingwhatishappening
e.g.Whenwillthepatientregainhisconsciousness?
Theblowcausedhimtoloseconsciousness.
2)alltheideas,thoughts,feelings,etc.ofapersonorpeople
e.g.Loveforfreedomrunsdeepinthenationalc
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